Frequency - Word Form
 92 o
  1 odh
  1 odhra
  1 odhran
  3 og
  2 ogan
  1 ograidh
  1 oibre
  1 oichdhe
  4 oidhch
 38 oidhche
  1 oifreil
 16 oigh
  6 oighe
  1 oil
  4 oir
  4 oirbh
  2 oirghil
 24 oirnn
  4 oirnne
  1 oiteag
  1 ol
  1 oladh
  1 olainn
 15 olc
  5 omh
  1 omhan
  1 onair
  3 or
  1 or-fhuilt
  6 ora
  1 orach
  1 oradh
  1 oran
  4 orduich
 11 orm
  1 orr
  5 ort
 18 os
  4 ostail
  5 ostal
  1 othrais